A head-mounted display

Abstract

The application discloses a head-mounted display, wherein the head-mounted display comprises a main body, two lens barrels and an adjusting system, the two lens barrels are transversely spaced apart and arranged on the main body, and each lens barrel is transversely movable; the adjusting system is in driving connection with the two lens barrels, and the adjusting system is arranged to be capable of driving one of the lens barrels in a single adjusting mode and driving the two lens barrels synchronously in a synchronous adjusting mode. The application aims to provide a head-mounted display with adjustable interpupillary distance for adapting to users with double pupils and asymmetric pupils.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of head-mounted display structure, and particularly relates to a head-mounted display. BACKGROUND

[0002] At present, all head-mounted displays such as base station type and integrated type are equipped with IPD interpupillary distance adjustment function in order to enhance the comfort experience of consumers in use. The products on the market mainly realize the interpupillary distance adjustment function by driving two lens barrels in opposite directions to move the same distance synchronously, but the human double pupils are not absolutely symmetrical in the middle of the VR (Virtual Reality) glasses product. Therefore, the same distance adjustment cannot completely accurately adapt to the interpupillary distance of the user. Therefore, there is an urgent need for a head-mounted display with freely adjustable interpupillary distance to adapt to the interpupillary distance of the asymmetric user. SUMMARY

[0003] The main purpose of the present application is to provide a head-mounted display which aims to provide a head-mounted display with adjustable interpupillary distance to adapt to the asymmetric user of double pupils.

[0004] To achieve the above purpose, the present application provides a head-mounted display, wherein the head-mounted display comprises a main body, two lens barrels and an adjustment system, the two lens barrels are transversely spaced apart and mounted on the main body, and each lens barrel is transversely movably arranged; the adjustment system is in transmission connection with the two lens barrels, and the adjustment system is arranged to be capable of driving one of the lens barrels in a single adjustment mode and driving the two lens barrels synchronously in a synchronous adjustment mode.

[0005] Optionally, the adjustment system comprises a driving part, the driving part is in transmission connection with the two lens barrels, and the driving part and the transmission paths of the two lens barrels are both formed with a clutch structure, so that the driving part has a single driving mode capable of being in transmission connection with a single lens barrel and a double driving mode capable of being in transmission connection with the two lens barrels at the same time.

[0006] Optionally, the adjustment system further comprises:

[0007] two power output parts, comprising two oppositely and spaced apart output gears, the two output gears are in transmission connection with the two lens barrels correspondingly;

[0008] a driving transmission mechanism, comprising a driving gear in transmission connection with the driving part, the driving gear is movably arranged between the two output gears to form the clutch structure, so that the driving gear has two first positions in transmission connection with the two output gears respectively and a second position in transmission connection with the two output gears at the same time; and,

[0009] An adjusting member is movably mounted on the main body to drive the driving gear to switch between the two first positions and the second position.

[0010] Optionally, the output gears are provided with internal gears, and the driving gear is provided with external gears at both ends, in the first position, the external gear at one end of the driving gear extends into the corresponding output gear and engages with the corresponding internal gear, and the other end is separated from the other output gear, in the second position, the external gears at both ends of the driving gear extend into the two output gears respectively, and engage with the two internal gears.

[0011] Optionally, the driving gear is provided with a transmission tooth part at the position between the two external gears, the transmission tooth part is in transmission connection with the driving part, the diameter of the external gear is greater than the diameter of the transmission tooth part, to form an annular groove between the two external gears, the adjusting member extends into the annular groove to push against the side wall of the external gear, to drive the driving gear to move.

[0012] Optionally, a positioning structure is arranged between the main body and the adjusting member, the positioning structure is used for positioning and fixing the adjusting member, so that the adjusting member positions the driving gear in the first position or the second position.

[0013] Optionally, the positioning structure includes a positioning protrusion arranged on one of the main body and the adjusting member, and a positioning groove arranged on the other.

[0014] Optionally, two positioning protrusions are arranged on the main body along the moving direction of the driving gear, and two positioning grooves are correspondingly arranged on the adjusting member, so that when one positioning protrusion cooperates with the corresponding positioning groove, the driving gear is located in the first position, and when the two positioning protrusions abut against both sides of the adjusting member in the moving direction of the driving gear, the driving gear is located in the second position.

[0015] Optionally, one end of the adjusting member extending into the annular groove is arranged along the side wall of the external gear.

[0016] Optionally, the adjusting member is provided with stop parts corresponding to the two output gears on both sides in the moving direction of the driving gear, so that when the driving gear is located in the first position engaging with one output gear, the stop parts abut against and fix the other output gear.

[0017] Optionally, the power output part further includes a rack mounted on the lens barrel, and the output gear is correspondingly provided with an external tooth part, so that the output gear engages with the rack to drive the lens barrel to move.

[0018] Optionally, the drive unit is rotatably mounted on the main body, and a first bevel gear is provided at one end of the drive unit facing the inner side of the main body;

[0019] The drive transmission mechanism further includes a first transmission gear and a second transmission gear mounted on the main body. The first transmission gear has a second bevel gear that cooperates with the first bevel gear at one end in the axial direction, and the other end of the first transmission gear in the axial direction is connected to the drive gear through the second transmission gear.

[0020] In the technical solution of the present invention, by setting the adjustment system in the head-mounted display and drivingly connecting the adjustment system with the lens barrel, the position adjustment of a single lens barrel and the simultaneous synchronous adjustment of two lens barrels can be realized to meet the interpupillary distance adjustment needs of different users, especially to meet the needs of users whose interpupillary distance is asymmetrical based on the head-mounted display. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a perspective view of an embodiment of the head-mounted display provided by the present invention;

[0023] Figure 2 for Figure 1 A three-dimensional schematic diagram of the middle section structure;

[0024] Figure 3 for Figure 1 Another three-dimensional schematic diagram of the middle part of the structure;

[0025] Figure 4 for Figure 1 A cross-sectional schematic diagram of the drive gear located at a first position;

[0026] Figure 5 for Figure 1 A cross-sectional schematic diagram of the drive gear located at the second position;

[0027] Figure 6 for Figure 1 A cross-sectional schematic diagram of the drive gear located at another first position.

[0028] Explanation of icon numbers:

[0029]

[0030]

[0031] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present application.

[0033] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0034] In addition, if the embodiments of the present application involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes A solution, or B solution, or A and B solutions. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is also not within the scope of protection claimed by the present application.

[0035] At present, all base station type, integrated type and other head-mounted displays are equipped with IPD interpupillary distance adjustment function in order to enhance the comfort experience of consumers during use. The products on the market mainly realize the interpupillary distance adjustment function by synchronously moving two lens barrels in opposite directions by the same distance manually or by motor driving. However, the human double pupils are not absolutely symmetrical in the middle based on the VR product. Therefore, the adjustment of the same distance cannot completely accurately adapt to the interpupillary distance of the user. Therefore, there is an urgent need for a head-mounted display with freely adjustable interpupillary distance to adapt to the asymmetric interpupillary distance of the user.

[0036] In view of this, the present application provides a head-mounted display, Figures 1 to 6An embodiment of the head-mounted display provided by the present application will be described below in combination with specific drawings.

[0037] Referring to Figures 1 to 6 The head-mounted display 100 comprises a main body 1, two lens barrels 2 and an adjusting system 3, the two lens barrels 2 are transversely spaced apart and mounted on the main body 1, and each lens barrel 2 is transversely movably arranged; the adjusting system 3 is in driving connection with the two lens barrels 2, and the adjusting system 3 is arranged to be capable of driving one of the lens barrels 2 in a single adjusting mode and driving the two lens barrels 2 synchronously in a synchronous adjusting mode.

[0038] In the technical scheme of the present application, by arranging the adjusting system 3 in the head-mounted display 100 and driving connecting the adjusting system 3 with the lens barrels 2, the position of a single lens barrel 2 is adjusted and the two lens barrels 2 are synchronously adjusted at the same time, so as to meet the pupil distance adjustment requirements of different users, especially the requirements of users with asymmetric pupil distance based on the head-mounted display 100.

[0039] Specifically, the adjusting system 3 comprises a driving part 31, the driving part 31 is in driving connection with the two lens barrels 2, and a clutch structure 32 is formed on the driving path of the driving part 31 and the two lens barrels 2, so that the driving part 31 has a single driving mode capable of driving a single lens barrel 2 and a double driving mode capable of driving the two lens barrels 2 at the same time. It can be understood that the adjusting system 3 can be arranged to drive the two lens barrels 2 independently by two driving devices, and the single adjusting mode and the synchronous adjusting mode can be realized by independently controlling the two driving devices to move, but such an arrangement is obviously high in cost and not practical. In the present embodiment, the driving part 31 is arranged to be in driving connection with the two lens barrels 2, and the clutch structure 32 is arranged to clutch control the driving path of the driving part 31 and the two lens barrels 2, so as to realize the single driving mode of driving a single lens barrel 2 to move and the double driving mode of driving the two lens barrels 2 to move synchronously.

[0040] Further, the adjusting system 3 further comprises two power output portions 33, a driving transmission mechanism 34 and an adjusting member 35, the two power output portions 33 comprise two opposite and spaced output gears 331, the two output gears 331 are correspondingly in transmission connection with the two lens barrels 2; the driving transmission mechanism 34 comprises a driving gear 341 in transmission connection with the driving portion 31, the driving gear 341 is movably arranged between the two output gears 331 to form the clutch structure 32, so that the driving gear 341 has two first positions respectively in individual transmission with the two output gears 331, and a second position in transmission connection with the two output gears 331 at the same time; the adjusting member 35 is movably installed on the main body 1 to drive the driving gear 341 to switch between the two first positions and the second position. The driving manner of the driving portion 31 driving the lens barrel 2 can be that a push rod is telescoped to push or pull the lens barrel 2, that is, a bidirectional synchronous telescopic push rod is arranged, and both ends of the push rod are arranged to be capable of matching a lens barrel 2, and a movable matching member is arranged on the lens barrel 2, when the lens barrel 2 needs to be adjusted, the matching member corresponding to the lens barrel 2 is driven to match the push rod, so that the push rod is connected with the lens barrel 2, and the lens barrel 2 is driven to move and adjust by the telescoping of the push rod, but obviously, when another lens barrel 2 needs to be adjusted after the adjustment of a lens barrel 2 is completed, the connection with the lens barrel 2 needs to be disconnected, and the push rod needs to be restored before another lens barrel 2 is connected for adjustment operation, which is complicated. Therefore, in the embodiment, the two output gears 331 are arranged in transmission connection with the two lens barrels 2, so that the two output gears 331 can be positioned and arranged, and the positions of the output gears 331 will not change regardless of the positions of the lens barrels 2, and the driving gear 341 is movably arranged between the two output gears 331 to realize that the driving gear 341 can be individually connected with one output gear 331 or simultaneously connected with the two output gears 331, the movement path of the driving gear 341 is fixed, which is convenient for adjustment, that is, the adjusting member 35 is convenient to arrange, in this way, the adjusting member 35 can be arranged on the main body 1, and a slot corresponding to the movement path of the adjusting member 35 is formed on the main body 1, so as to facilitate manual adjustment outside the main body 1.

[0041] Further, the output gears 331 are provided with internal gears 331a, and the drive gears 341 are provided with external gears 341a at two ends, when the drive gears 341 are in the first position, the external gears 341a at one end of the drive gears 341 extend into the corresponding output gears 331 and engage with the corresponding internal gears 331a, and the other end is separated from the other output gear 331, when the drive gears 341 are in the second position, the external gears 341a at two ends of the drive gears 341 extend into two output gears 331 respectively, and engage with two internal gears 331a. The spacing mode of the two output gears 331 can be lateral spacing, that is, the rotation axes of the two output gears 331 are arranged in parallel, in this way, the driving mode of the output gears 331 to the lens barrel 2 can be that the output gears 331 are fixed on a screw rod, the screw rod rotates and cooperates with the lens barrel 2, the rotation of the output gears 331 drives the rotation of the screw rod to drive the movement of the lens barrel 2, but in this way, the drive gears 341 cannot be switched between the two first positions and the second position through linear motion, that is, the adjustment of the driving mode of the drive gears 341 by the adjusting member 35 is relatively complex. In the embodiment, the two output gears 331 are coaxial, and the drive gears 341 are located between the two output gears 331, in this way, the drive gears 341 only need to move in the opposite direction of the two output gears 331, that is, the axial movement of the drive gears 341 itself can realize the switching of the drive gears 341 between the two positions. Therefore, compared with the other setting scheme described above, the setting of the drive gears 341 in the embodiment is obviously simpler, and the driving mode of the drive gears 341 adjusted by the adjusting member 35 is also relatively simple, in general, the structural scheme adopted in the embodiment is relatively simple and practical, and is convenient to set. It can be understood that the axis of the drive gears 341 can also be parallel to the axes of the two output gears 331, that is, the two external gears 341a of the drive gears 341 realize clutch transmission by engaging with the external tooth portions 331b of the output gears 331, in the embodiment, the drive gears 341 are coaxial with the two output gears 331, so that the two output gears 331 can be installed on the same rotation shaft with the drive gears 341, in this way, the utilization rate of the rotation shaft is improved, and the structure is simplified, according to this setting mode, a receiving groove is formed in the middle of the output gear 331, the groove wall of the receiving groove forms the internal gear 331a, so that the external gear 341a can extend into the receiving groove and engage with the internal gear 331a to realize the transmission between the drive gears 341 and the output gears 331.Similarly, it can be understood that the specific structure of the driving gear 341 and the output gear 331 is not limited to the gear structure. For example, in the structure of the present embodiment, by setting the slot wall of the accommodating slot to be rough and setting the inner diameter to be tapered from outside to inside, the two ends of the driving gear 341 can be set to any structure, which can ensure that the driving gear 341 can extend into the accommodating slot. The two ends of the driving gear 341 can abut against the slot wall of the accommodating slot, and the output gear 331 can be driven to rotate by friction. In this way, the transmission function can also be achieved. In the present embodiment, the gear meshing mode is adopted, so that the transmission is more stable and reliable, and the reliability is strong.

[0042] In addition, the power output part 33 further comprises a rack 332 mounted on the lens barrel 2, and the output gear 331 is correspondingly provided with an external tooth part 331b, so that the output gear 331 meshes with the rack 332 to drive the lens barrel 2 to move. The two output gears 331 can directly mesh with the tooth structure on the lens barrel 2 to drive the lens barrel 2 to move. However, as described above, the two output gears 331 are coaxially arranged, and the visual centers of the two lens barrels 2 must be a certain distance apart to meet the interpupillary distance of the user. Therefore, the size of the lens barrel 2 is too large to meet the driving of the output gear 331. Therefore, in the present embodiment, the rack 332 is arranged on the lens barrel 2 to avoid increasing the size of the lens barrel 2, so that the driving of the output gear 331 to the lens barrel 2 can be achieved, and the structure is simple, easy to install and low in cost.

[0043] Further, the driving gear is provided with a transmission tooth portion 341b at a position between the two outer gears, the transmission tooth portion 341b is in transmission connection with the driving portion, the diameter of the outer gear 341a is greater than that of the transmission tooth portion 341b, so as to form an annular groove 342 between the two outer gears 341a, the adjusting member 35 extends into the annular groove 342 to push against the side wall of the outer gear 341a, and drives the driving gear 341 to move. The adjusting member 35 can be fixed on the shaft of the driving gear 341, and the position of the driving gear 341 can be adjusted by pushing and pulling the adjusting member 35 along the axial direction of the driving gear 341. However, it is obvious that the structure of the driving gear 341 and the adjusting member 35 is complex, difficult to process, high in cost, and poor in practicability. Therefore, in the embodiment, the diameter of the outer gear 341a is greater than that of the transmission tooth portion 341b, so that the side wall of the outer gear 341a exceeds the transmission tooth portion 341b to form a stepped portion, and the annular groove 342 is defined between the two stepped portions. The adjusting member 35 extends into the annular groove 342 from the radial direction of the driving gear 341, and then pushes the outer gear 341a to drive the driving gear 341 to move by abutting against the side wall of the outer gear 341a. In this way, the structure is simple and low in cost.

[0044] Further, the main body 1 and the adjusting member 35 are provided with a positioning structure 4, which is used for positioning and fixing the adjusting member 35, so that the adjusting member 35 positions the driving gear 341 at the first position or the second position. The adjusting member 35 is installed on the main body 1, and the first position and the second position of the driving gear 341 are positioned by the positioning structure 4 between the main body 1 and the adjusting member 35. In this way, the stability during the adjustment of the lens barrel 2 is improved.

[0045] Specifically, the positioning structure 4 comprises a positioning protrusion 41 arranged on one of the main body 1 and the adjusting member 35, and a positioning recess 42 arranged on the other. The positioning structure 4 can be an elastic member arranged on one of the adjusting member 35 and the main body 1, and a recess arranged on the other, and the positioning of the adjusting member 35 is achieved by the abutting of the elastic member against the recess. In the embodiment, the positioning structure 4 adopts a structure of protrusion against recess, i.e. the positioning protrusion 41 and the positioning recess 42 are arranged, and the positioning of the adjusting member 35 is achieved by the cooperation of the positioning protrusion 41 and the positioning recess 42. In the embodiment, the adjusting member 35 can move beyond the positioning protrusion 41 by the deformation of the positioning protrusion 41 and the adjusting member 35 itself, and the positioning protrusion 41 can extend into the positioning recess 42 to achieve the positioning when the positioning protrusion 41 reaches the positioning recess 42. The structure is simple and low in cost.

[0046] Specifically, two positioning protrusions 41 are arranged on the main body 1 along the moving direction of the drive gear 341, and two positioning recesses 42 are correspondingly arranged on the adjusting member 35, so that the drive gear 341 is located at the first position when one of the positioning protrusions 41 cooperates with the corresponding positioning recess 42, and the drive gear 341 is located at the second position when the two positioning protrusions 41 abut against the two sides of the adjusting member 35 in the moving direction of the drive gear 341. Three positioning structures 4, i.e. three pairs of positioning protrusions 41 and positioning recesses 42, can be arranged on the main body 1 and the adjusting member 35 according to the two first positions and one second position. In the embodiment, two pairs of positioning structures 4, i.e. two positioning protrusions 41 and two positioning recesses 42, are arranged to correspond to the two first positions, so as to achieve the positioning of the first position. Meanwhile, the distance between the two positioning protrusions 41 is equal to the size of the adjusting member 35, i.e. the two positioning protrusions 41 abut against the two ends of the adjusting member 35 when the adjusting member 35 moves between the two positioning protrusions 41, so as to achieve the positioning of the adjusting member 35 at the second position by the two positioning protrusions 41 without the positioning recess 42, which is ingenious in design and low in cost.

[0047] In addition, one end of the adjusting member 35 extending into the annular groove 342 is arranged along the side wall of the outer gear 341a. In order to ensure the stability of the adjusting member 35 pushing the outer gear 341a, the contact area between the adjusting member 35 and the side wall of the outer gear 341a is increased. Specifically, in the embodiment, the end of the adjusting member 35 is extended along the groove wall of the annular groove 342 to form an arc-shaped structure avoiding the driving gear 341, so as to increase the pushing area without affecting the rotation of the driving gear 341 and improve the stability.

[0048] In addition, the adjusting member 35 is provided with a stop portion 351 corresponding to two output gears 331 on both sides in the moving direction of the driving gear 341, so that when the driving gear 341 is located at the first position engaged with one output gear 331, the stop portion 351 abuts against and fixes the other output gear 331. When the driving gear 341 drives the outer gear 341a to be located at the first position, the outer gear 341a is disengaged from the corresponding output gear 331, at which time the output gear 331 is in a free state and may rotate, which may drive the lens barrel 2 to move, resulting in the unadjusted position of the lens barrel 2 moving and affecting the use experience. Therefore, in the embodiment, the stop portion 351 is arranged on the adjusting member 35 and abuts against the output gear 331 to fix the output gear 331, so as to solve the above problem. It can be understood that the abutting position of the stop portion 351 can be the tooth portion of the output gear 331, i.e. the stop portion 351 laterally extends into the tooth root of the tooth portion of the output gear 331 to be fixed, which has better fixing effect. However, since the deflection angle of the output gear 331 is not fixed, the stop portion 351 may laterally abut against the tooth of the tooth portion of the output gear 331, which affects the normal use effect. Therefore, in the embodiment, the stop portion 351 is directly arranged to abut against the side portion of the output gear 331, which has no limitation on the abutting position and has high tolerance and stable use.

[0049] Further, the driving part 31 is rotatably installed on the main body 1, and one end of the driving part 31 towards the inside of the main body 1 is provided with a first bevel gear 311; the driving transmission mechanism 34 further comprises a first transmission gear 343 and a second transmission gear 344 installed on the main body 1, one end of the first transmission gear 343 in the axial direction is provided with a second bevel gear 343a matched with the first bevel gear 311, and the other end of the first transmission gear 343 in the axial direction is drivingly connected with the driving gear 341 through the second transmission gear 344. The driving part 31 can be an electric driving part installed in the main body 1, or a manual control part extending out of the main body 1, which is not limited here, as long as it can realize the adjusting function. In this embodiment, the driving part 31 is directly installed on the main body 1, and the driving part 31 is manually controlled to rotate to realize the driving of the driving gear 341. Compared with the electric control, the manually controlled driving part 31 is more reliable and stable. At the same time, in order to facilitate the structural arrangement of the main body 1, the transmission connection mode between the driving part 31 and the driving gear 341 is set as gear connection, so as to change the transmission direction of the driving gear 341 and the driving part 31, facilitate the arrangement of the overall structure in the main body 1, and the connection is stable, high in precision, and good in adjusting hand feeling.

[0050] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the inventive concept of the present application and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A head-mounted display, characterized in that, include: main body; Two lens barrels, the two lens barrels being installed laterally spaced apart from the main body, and each lens barrel being laterally movable; and, An adjustment system is drivenly connected to the two lens barrels, and the adjustment system is configured to drive one of the lens barrels individually in a single adjustment mode and to drive both lens barrels simultaneously in a synchronous adjustment mode, so that the position of a single lens barrel can be adjusted in the single adjustment mode, or the position of both lens barrels can be adjusted synchronously in the synchronous adjustment mode. The adjustment system includes a drive unit, which is connected to both of the lens barrels. A clutch structure is formed on the transmission path between the drive unit and the two lens barrels, so that the drive unit has a single drive mode that can be connected to a single lens barrel and a dual drive mode that can be connected to both lens barrels simultaneously. The regulating system also includes: Two power output sections include two opposing and spaced-apart output gears, and the two output gears are correspondingly connected to the two mirror barrels in a transmission connection. A drive transmission mechanism includes a drive gear that is driveably connected to the drive unit. The drive gear is movably disposed between two output gears to form the clutch structure, such that the drive gear has two first positions that are individually driveable by the two output gears, and a second position that is simultaneously driveably connected to both output gears; and... An adjusting element is movably mounted on the main body to drive the drive gear to switch between the two first positions and the second position.

2. The head-mounted display as claimed in claim 1, characterized in that, The output gear is provided with an internal gear, and the two ends of the drive gear are provided with external gears. When the drive gear is in the first position, the external gear at one end extends into the corresponding output gear and meshes with the corresponding internal gear, while the other end is separated from the other output gear. When the drive gear is in the second position, the external gears at both ends extend into the two output gears respectively and mesh with the two internal gears.

3. The head-mounted display as described in claim 2, characterized in that, The drive gear is provided with a transmission tooth portion located between the two external gears. The transmission tooth portion is connected to the drive unit. The diameter of the external gear is larger than the diameter of the transmission tooth portion, so as to form an annular groove between the two external gears. The adjusting member extends into the annular groove to push against the side wall of the external gear, thereby driving the drive gear to move.

4. The head-mounted display as described in claim 3, characterized in that, A positioning structure is provided between the main body and the adjusting member. The positioning structure is used to position and fix the adjusting member so that the adjusting member positions the drive gear at the first position or the second position.

5. The head-mounted display as claimed in claim 4, characterized in that, The positioning structure includes a positioning protrusion disposed on one of the main body and the adjusting member, and a positioning groove disposed on the other.

6. The head-mounted display as claimed in claim 5, characterized in that, The main body is provided with two positioning protrusions spaced apart along the active direction of the drive gear, and the adjusting member is provided with two corresponding positioning grooves, so that when one positioning protrusion engages with its corresponding positioning groove, the drive gear is located in the first position, and when the two positioning protrusions abut against the adjusting member on both sides of the active direction of the drive gear, the drive gear is located in the second position.

7. The head-mounted display as claimed in claim 3, characterized in that, The adjusting member extends into the annular groove at one end and extends along the side wall of the external gear.

8. The head-mounted display according to any one of claims 1 to 7, characterized in that, The adjusting member is provided with stop portions on both sides of the drive gear in the direction of movement, corresponding to the two output gears, so that when the drive gear is in the first position of meshing with one of the output gears, the stop portions abut against and fix the other output gear.

9. The head-mounted display according to any one of claims 1 to 7, characterized in that, The power output unit also includes a rack mounted on the lens barrel, and the output gear is provided with an external tooth portion so that the output gear meshes with the rack to drive the lens barrel to move.

10. The head-mounted display according to any one of claims 1 to 7, characterized in that, The drive unit is rotatably mounted on the main body, and a first bevel gear is provided at one end of the drive unit facing the inside of the main body; The drive transmission mechanism further includes a first transmission gear and a second transmission gear mounted on the main body. The first transmission gear has a second bevel gear that cooperates with the first bevel gear at one end in the axial direction, and the other end of the first transmission gear in the axial direction is connected to the drive gear through the second transmission gear.

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